Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..421h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 2, Sept. 1984, p. 421-430.
Astronomy and Astrophysics
Astrophysics
49
Early Stars, Magnetic Stars, Peculiar Stars, Stellar Atmospheres, Stellar Magnetospheres, Abundance, Chemical Fractionation, Infrared Radiation, Metallicity, Plasma Density, Plasma Temperature, X Rays
Scientific paper
The characteristics of circumstellar material around chemically peculiar stars are analyzed to obtain explanations for existing emission feature data. Attention is focused on magnetospheric plasma densiteis (MPD) and temperatures, assuming the stellar surface is the source of the plasma. The MPD increases from the surface outward to the Alfven limit and is dependent on the stellar temperature. The plasma is transported outward after magnetic field lines break due to an excess of plasma. The breaking results in particle acceleration and heating of the magnetospheric plasma, which cools in outer regions by emitting X rays. Neutral diffusion in outward propagating particles produces chemical fractionation, leading to observed metal and rare earth overabundances and deficiencies of light elements.
Goertz Christoph K.
Havnes Ove
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